AC_PosControl: hover throttle default to 0.5

libraries/AC_AttitudeControl/AC_PosControl.h

@@ -14,7 +14,7 @@
 
 
 // position controller default definitions
-#define POSCONTROL_THROTTLE_HOVER               500.0f  // default throttle required to maintain hover
+#define POSCONTROL_THROTTLE_HOVER               0.5f    // default throttle required to maintain hover
 #define POSCONTROL_ACCELERATION_MIN             50.0f   // minimum horizontal acceleration in cm/s/s - used for sanity checking acceleration in leash length calculation
 #define POSCONTROL_ACCEL_XY                     100.0f  // default horizontal acceleration in cm/s/s.  This is overwritten by waypoint and loiter controllers
 #define POSCONTROL_ACCEL_XY_MAX                 980.0f  // max horizontal acceleration in cm/s/s that the position velocity controller will ask from the lower accel controller